We can't help: we have no idea where the "3 Tikki-chat"s come from - there is only one in your input data, and we have no idea why it should be counted three times, or "Tikki" once when there are two of them.
If your output should be this:
quantity Item TableNo
1 Tikki-chat 1
1 Dal 1
2 Tikki 1
2 Samosa 1
Then that needs an Sql GROUP BY clause, something like this:
SELECT SUM(Quantity), Item, TableNo
GROUP BY Item, TableNo
But if it isn't, then we have no idea.